The Streamlight Stylus LED flashlight is an ultra slim LED pen light that fits conveniently in a shirt pocket, backpack or hand bag. It is made from machined, black, aluminum case that is lightweight, heavy duty, waterproof is just over 6.6" long and weighs only 1.1 ounces. The Stylus LED flashlight has a momentary push button switch in the tail cap and the tail cap is a continuous "on" twist type switch. It can operate for over 10 hours on a single set of 3 AAAA alkaline batteries.